Open metallic cord for penetration by elastomer

Abstract

Metallic cord for reinforcing elastomeric articles and apparatus for making same including a round section and equal diameter filaments and a core (11) of two strands of two filaments (5,6,15,16) one strand being untwisted and the other strand having a twist and a first lay length so as to be twisted around the one strand. An outer layer (12) of filaments (21-28) twisted around the core (11) and having the same twist direction and a second lay length half of the core (11) lay length.

I claim: 
     
       1. A metallic cord for reinforcing elastomeric articles, the cord having a plurality of filaments comprising a core of m filaments being untwisted and n filaments twisted about each other and twisted around the m filaments wherein m is 2 to 3 and n is 1 to 3; and   an outer layer of p filaments twisted around the core and having the same twist direction as the core, wherein p is 6 to 9.   
     
     
       2. A metallic cord as described in claim 1, wherein the n filaments of the core have a first lay length and the p filaments of the outer layer have a second lay length, half said fist lay length. 
     
     
       3. A metallic cord as described in claim 2, wherein the first lay length ranges from 14 to 34 mm. 
     
     
       4. A metallic cord as described in claim 2, wherein the first lay length ranges from 22 to 26 mm. 
     
     
       5. A metallic cord as described in claim 2, wherein a filament is wrapped around said outer layer, the wrapping filament having a twist direction opposed to the twist direction of the outer layer and a lay length at most half said second lay length. 
     
     
       6. A metallic cord as described in claim 5, wherein the wrapping filament has a diameter ranging between 0.12 and 0.18 mm. 
     
     
       7. A metallic cord as described in claim 1, wherein m equals 2, n equals 2 and p equals 8. 
     
     
       8. A metallic cord as described in claim 1, wherein m equals 2, n equals 2 and p equals 9. 
     
     
       9. A metallic cord as described in claim 1, wherein the diameter of all the filaments is from 0.20 to 0.30 mm.